Biology
The gas released during the photosynthesis by the green plants is

Oxygen
Nitrogen
Carbon dioxide
Water vapour

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Biology
Which statement describes decomposers?

Decomposers are insignificant organisms in the ecosystem and can be absent in some ecosystems
All listed here
Decomposers are those organisms that recycle matter in the ecosystem
Decomposers can produce their own source of energy and can sometimes act as primary producers

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